Search results
Results from the WOW.Com Content Network
The brown algae include the largest and fastest growing of seaweeds. [6] Fronds of Macrocystis may grow as much as 50 cm (20 in) per day, and the stipes can grow 6 cm (2.4 in) in a single day. [13] Growth in most brown algae occurs at the tips of structures as a result of divisions in a single apical cell or in a row of such
In a reversal of the pattern on land, in the oceans, almost all photosynthesis is performed by algae and cyanobacteria, with a small fraction contributed by vascular plants and other groups. Algae encompass a diverse range of organisms, ranging from single floating cells to attached seaweeds. They include photoautotrophs from a variety of groups.
Nereocystis is a brown macroalgae that derives chemical energy from photosynthesis. Nereocystis in particular, similar to Pelagophycus porra, can be identified by a single large pneumatocyst between the end of its hollow stipe and the blades. [6] Individuals can grow to a maximum of 36 m (118 ft). [7]
These are the brown algae, [57] —some of which may reach 50 m in length [58] —the red algae, [59] and the green algae. [60] The most complex forms are found among the charophyte algae (see Charales and Charophyta ), in a lineage that eventually led to the higher land plants.
Kelps are large brown algae or seaweeds that make up the order Laminariales.There are about 30 different genera. [3] Despite its appearance and use of photosynthesis in chloroplasts, kelp is technically not a plant but a stramenopile (a group containing many protists).
Desmarestia viridis is a species of brown algae and a member of the phylum Ochrophyta. [1] It is also known as stringy acid kelp, and is the most acidic of the acid kelps with a vacuolar pH of about 1. [2] It is best known for releasing sulfuric acid when damaged, usually destroying itself and other nearby marine plant life. [3]
Fucoxanthin is present in brown seaweeds and diatoms and was first isolated from Fucus, Dictyota, and Laminaria by Willstätter and Page in 1914. [7] Seaweeds are commonly consumed in south-east Asia and certain countries in Europe, while diatoms are single-cell planktonic microalgae characterized by a golden-brown color, due to their high content of fucoxanthin.
Photosynthetic organisms with plastids of different origin (such as brown algae) do not belong to the Archaeplastida. The archaeplastidans fall into two main evolutionary lines. The red algae are pigmented with chlorophyll a and phycobiliproteins , like most cyanobacteria, and accumulate starch outside the chloroplasts.